Revert "xen-netback: improve ring effeciency for guest RX"
Revert "xen-netback: improve ring effeciency for guest RX"

This reverts commit 4f0581d25827d5e864bcf07b05d73d0d12a20a5c.

The named changeset is causing problem. Let's aim to make this part less
fragile before trying to improve things.

Signed-off-by: Wei Liu <a5240e9e4c4d742e3a4232ca749f78defd45d722@citrix.com>
Cc: Ian Campbell <9be92b3dbbd6611e3e4c9209fb3d04b4919e7cca@citrix.com>
Cc: Annie Li <8668fcb95be6f4a821155ebc3cc89de0caf5c886@oracle.com>
Cc: Matt Wilson <260f5074942ca36dab941199ff6b19fcaa26ccde@amazon.com>
Cc: Xi Xiong <952d643c5c6afd960fdc66eda7d2af35ebffda16@amazon.com>
Cc: David Vrabel <b9d45bd1f671e508cd8daa63dfc3cabb597562df@citrix.com>
Cc: Paul Durrant <dba6cd059c0054f8a3c62ba902cd9d7238853ee4@citrix.com>
Acked-by: Ian Campbell <9be92b3dbbd6611e3e4c9209fb3d04b4919e7cca@citrix.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs